AS-Interface
PROFIBUS DP
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group · Tel.: Germany (6 21) 7 76-0 · USA (3 30) 4 25 35 55 · Singapore 7 79 90 91 · Internet http://www.pepperl-fuchs.com
Issue date - 21.12.2005
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7.1.3.3 AS-i 16-Bit Data
In addition to the access via the command interfaces, the 16-bit data for or by the
slaves with 16-bit value can by exchanged cyclically (profile 7.3., S-7.4, S-6.0, S-
7.5, S-7.A.8, S-7.A.9, S-7.A.A). Competing writing access attemps on analog out
-
put data will not be blocked by each other. If analog data for a particular slave are
being transmitted both cyclically and acyclically with the command interface or via
DP
V1 connections, the acyclically transmitted values will be overwritten by the cy-
clically transmitted values.
AS-i 16-bit data can be transmitted in a reserved data area. Therefore accessing
analog data is as easy as accessing digital data.
7.1.3.4 Command Interface
Only using the IDs of the process data field the AS-i/PROFIBUS gateway can be
used as M0 AS-i master. By using the command interface
(see chapter 7.1.3) the
functions of a M3 master become available.
A-Slaves map the data on channels 1 and 2.
B-Slaves map the data on channels 3 and 4.
AS-i 16-bit data
byte
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1 slave 31-n/8, channel 1, high byte
2 slave 31-n/8, channel 1, low byte
3 slave 31-n/8, channel 2, high byte
4 slave 31-n/8, channel 2, low byte
… …
n-3 slave 31, channel 3/slave 31B, channel 1, high byte
n-2 slave 31, channel 3/slave 31B, channel 1, low byte
n-1 slave 31, channel 4/slave 31B, channel 2, high byte
n slave 31, channel 4/slave 31B, channel 2, low byte
Request
byte
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1 command
2 T circuit
3 request parameter byte 1
… …
36 request parameter byte 34
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